mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![TingHan Shen](/assets/img/avatar_default.png)
Some of mediatek processors contain the Tensilica HiFix DSP for audio processing. The communication between Host CPU and DSP firmware is taking place using a shared memory area for message passing. ADSP IPC protocol offers (send/recv) interfaces using mediatek-mailbox APIs. We use two mbox channels to implement a request-reply protocol. Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com> Signed-off-by: TingHan Shen <tinghan.shen@mediatek.com> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Curtis Malainey <cujomalainey@chromium.org> Reviewed-by: Tzung-Bi Shih <tzungbi@google.com> Reviewed-by: YC Hung <yc.hung@mediatek.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Link: https://lore.kernel.org/r/20220512082215.3018-2-tinghan.shen@mediatek.com Signed-off-by: Mark Brown <broonie@kernel.org>
157 lines
3.5 KiB
C
157 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2022 MediaTek Corporation. All rights reserved.
|
|
* Author: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
|
|
*/
|
|
|
|
#include <linux/firmware/mediatek/mtk-adsp-ipc.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mailbox_client.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
|
|
/*
|
|
* mtk_adsp_ipc_send - send ipc cmd to MTK ADSP
|
|
*
|
|
* @ipc: ADSP IPC handle
|
|
* @idx: index of the mailbox channel
|
|
* @msg: IPC cmd (reply or request)
|
|
*
|
|
* Returns zero for success from mbox_send_message
|
|
* negative value for error
|
|
*/
|
|
int mtk_adsp_ipc_send(struct mtk_adsp_ipc *ipc, unsigned int idx, uint32_t msg)
|
|
{
|
|
struct mtk_adsp_chan *adsp_chan;
|
|
int ret;
|
|
|
|
if (idx >= MTK_ADSP_MBOX_NUM)
|
|
return -EINVAL;
|
|
|
|
adsp_chan = &ipc->chans[idx];
|
|
ret = mbox_send_message(adsp_chan->ch, &msg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtk_adsp_ipc_send);
|
|
|
|
/*
|
|
* mtk_adsp_ipc_recv - recv callback used by MTK ADSP mailbox
|
|
*
|
|
* @c: mbox client
|
|
* @msg: message received
|
|
*
|
|
* Users of ADSP IPC will need to privde handle_reply and handle_request
|
|
* callbacks.
|
|
*/
|
|
static void mtk_adsp_ipc_recv(struct mbox_client *c, void *msg)
|
|
{
|
|
struct mtk_adsp_chan *chan = container_of(c, struct mtk_adsp_chan, cl);
|
|
struct device *dev = c->dev;
|
|
|
|
switch (chan->idx) {
|
|
case MTK_ADSP_MBOX_REPLY:
|
|
chan->ipc->ops->handle_reply(chan->ipc);
|
|
break;
|
|
case MTK_ADSP_MBOX_REQUEST:
|
|
chan->ipc->ops->handle_request(chan->ipc);
|
|
break;
|
|
default:
|
|
dev_err(dev, "wrong mbox chan %d\n", chan->idx);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int mtk_adsp_ipc_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct mtk_adsp_ipc *adsp_ipc;
|
|
struct mtk_adsp_chan *adsp_chan;
|
|
struct mbox_client *cl;
|
|
char *chan_name;
|
|
int ret;
|
|
int i, j;
|
|
|
|
device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
|
|
|
|
adsp_ipc = devm_kzalloc(dev, sizeof(*adsp_ipc), GFP_KERNEL);
|
|
if (!adsp_ipc)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
|
|
chan_name = kasprintf(GFP_KERNEL, "mbox%d", i);
|
|
if (!chan_name) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
adsp_chan = &adsp_ipc->chans[i];
|
|
cl = &adsp_chan->cl;
|
|
cl->dev = dev->parent;
|
|
cl->tx_block = false;
|
|
cl->knows_txdone = false;
|
|
cl->tx_prepare = NULL;
|
|
cl->rx_callback = mtk_adsp_ipc_recv;
|
|
|
|
adsp_chan->ipc = adsp_ipc;
|
|
adsp_chan->idx = i;
|
|
adsp_chan->ch = mbox_request_channel_byname(cl, chan_name);
|
|
if (IS_ERR(adsp_chan->ch)) {
|
|
ret = PTR_ERR(adsp_chan->ch);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(dev, "Failed to request mbox chan %d ret %d\n",
|
|
i, ret);
|
|
goto out_free;
|
|
}
|
|
|
|
dev_dbg(dev, "request mbox chan %s\n", chan_name);
|
|
kfree(chan_name);
|
|
}
|
|
|
|
adsp_ipc->dev = dev;
|
|
dev_set_drvdata(dev, adsp_ipc);
|
|
dev_dbg(dev, "MTK ADSP IPC initialized\n");
|
|
|
|
return 0;
|
|
|
|
out_free:
|
|
kfree(chan_name);
|
|
out:
|
|
for (j = 0; j < i; j++) {
|
|
adsp_chan = &adsp_ipc->chans[j];
|
|
mbox_free_channel(adsp_chan->ch);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mtk_adsp_ipc_remove(struct platform_device *pdev)
|
|
{
|
|
struct mtk_adsp_ipc *adsp_ipc = dev_get_drvdata(&pdev->dev);
|
|
struct mtk_adsp_chan *adsp_chan;
|
|
int i;
|
|
|
|
for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
|
|
adsp_chan = &adsp_ipc->chans[i];
|
|
mbox_free_channel(adsp_chan->ch);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver mtk_adsp_ipc_driver = {
|
|
.driver = {
|
|
.name = "mtk-adsp-ipc",
|
|
},
|
|
.probe = mtk_adsp_ipc_probe,
|
|
.remove = mtk_adsp_ipc_remove,
|
|
};
|
|
builtin_platform_driver(mtk_adsp_ipc_driver);
|
|
|
|
MODULE_AUTHOR("Allen-KH Cheng <allen-kh.cheng@mediatek.com>");
|
|
MODULE_DESCRIPTION("MTK ADSP IPC Driver");
|
|
MODULE_LICENSE("GPL");
|